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<?xml version="1.0" encoding="UTF-8" ?>
<Effect>
<MetaData>
<Property name="Dispersion" formalName="Aberration Amount" description="Amount of Chromatic Aberration" default="0"/>
<Property name="FocusDepth" formalName="Focus Depth" description="Dispersion will scale in relation\nto distance from this depth" default="0"/>
<Property name="MaskSampler" formalName="Effect Mask" description="Grayscale texture to control where and how\nstrong on screen the aberration effect occurs" type="Texture" filter="linear" clamp="clamp" default="./maps/effects/white.png" />
<Property name="DepthDebug" formalName="Debug Dispersion Amount" type="Boolean" description="Allows you to see effect of controls.\nBlack objects will disperse less and\nwhite will disperse more" default="False"/>
<Property name="DepthSampler" type="Texture" filter="nearest" clamp="clamp"/>
<Property name="SourceSampler" type="Texture" filter="linear" clamp="clamp"/>
</MetaData>
<Shaders>
<Shader Name="DISPERSE">
<FragmentShader>
#include "depthpass.glsllib"
uniform vec2 CameraClipRange;
void frag()
{
vec4 depthSample = texture(DepthSampler, TexCoord);
float depthVal = getDepthValue( depthSample, CameraClipRange );
float rawDepth = depthValueToLinearDistance( depthVal, CameraClipRange );
float depthScale = abs(CameraClipRange.y - CameraClipRange.x);
float depthDisp = abs(rawDepth - FocusDepth) / depthScale;
float finalDisperse = Dispersion * depthDisp;
float effectAmt = texture(MaskSampler, TexCoord).x;
if ( DepthDebug )
{
gl_FragColor.rgb = vec3( depthDisp * effectAmt );
return;
}
gl_FragColor = texture(SourceSampler, TexCoord);
ivec2 texSize = textureSize( SourceSampler, 0 );
vec2 dispDir = normalize( TexCoord.xy - vec2(0.5) );
dispDir /= 2.0 * vec2( texSize );
vec3 mixColor;
mixColor = gl_FragColor.rgb;
mixColor.r = texture(SourceSampler, TexCoord+dispDir*finalDisperse).r;
mixColor.b = texture(SourceSampler, TexCoord-dispDir*finalDisperse).b;
gl_FragColor.rgb = mix( gl_FragColor.rgb, mixColor, effectAmt );
}
</FragmentShader>
</Shader>
</Shaders>
<Passes>
<Pass shader="DISPERSE">
<BufferInput value="[source]" param="SourceSampler" />
<DepthInput param="DepthSampler"/>
</Pass>
</Passes>
</Effect>
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